1. Womic Steel: Manufacturing Capabilities & Company Strength
Womic Steel Group is a premier manufacturer and global exporter with over 20 years of expertise in producing carbon, alloy, and stainless steel tubular products. Our state-of-the-art SSAW pipe production facility spans a comprehensive manufacturing capability exceeding 15,000 tons per month for spiral submerged arc welded steel pipe piles, serving Japanese and Asian marine projects.
Production Size Range for SSAW Steel Pipe Pile: Outside diameter from 508mm to 3,000mm (20 inch to 120 inch) for SSAW process. Wall thickness from 6.0mm to 25.4mm. Single lengths from 6m to 18m standard, with custom lengths up to 60m available for deep foundation projects.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified: Quality Management System for piling pipe production and quality control processes.
API 5L / API 2B Monogram License: Womic Steel holds API 5L and API 2B licenses, demonstrating our commitment to high-quality manufacturing standards.
CE Marking (PED 2014/68/EU): CE marking is available upon request.
EN 10204 3.2 Certification: In addition to standard 2.2 and 3.1 Mill Test Certificates, we supply products with Inspection Certificate 3.2.
Third-Party Inspection (TPI) Approvals: Our products and production processes are approved and audited by major international agencies including SGS, BV, ABS, LR, DNV, and TÜV.
Global Recognition: Womic Steel is a trusted supplier to global EPC contractors, port authorities, and marine engineering firms, serving over 80 countries including Japan, Korea, Southeast Asia, and the Middle East.
2. JIS A5525 SKK490: Material Composition & Performance Characteristics
JIS A5525 SKK490 is the Japanese Industrial Standard for steel pipe piles used in harbor and marine structures. "SKK" denotes steel pipe pile for harbor structures, and "490" indicates the minimum tensile strength of 490 MPa (71,100 psi). SKK490 offers a minimum yield strength of 325 MPa (47,100 psi) and is widely specified for port construction, wharf piling, and breakwater foundations in Asian markets.
JIS A5525 SKK490 is specifically formulated for piling applications, offering excellent weldability for field splicing, good low-temperature toughness for marine environments, and sufficient ductility to withstand driving stresses during pile installation. Compared to JIS A5525 SKK400, SKK490 provides higher strength, allowing for deeper driving depths and reduced pile quantities.
Chemical Composition (Ladle Analysis, % by mass):
| Element | JIS A5525 SKK490 (Max %) |
| C | 0.24 |
| Si | 0.55 |
| Mn | 1.40 |
| P | 0.040 |
| S | 0.040 |
| Cu | 0.20 (when specified) |
Note: JIS A5525 SKK490 has limits on carbon, phosphorus, and sulfur to ensure good weldability for piling applications.
Mechanical Properties (Room Temperature):
| Property | JIS A5525 SKK490 |
| Yield Strength (min) | 325 MPa (47,100 psi) |
| Tensile Strength (min) | 490 MPa (71,100 psi) |
| Elongation (min) | 19% (Longitudinal) |
| Impact Toughness | Not specified (optional) |
Note: JIS A5525 SKK490 offers a higher tensile strength (490 MPa) compared to ASTM A252 GR.3 (455 MPa), making it suitable for applications requiring high tensile capacity.
Comparison of JIS A5525 Steel Pipe Pile Grades:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Typical Application |
| SKK400 | 235 | 400 | Light harbor piling, sheet piling |
| SKK490 | 325 | 490 | Heavy marine piling, port construction |
| SKK540 | 390 | 540 | Heavy load, deep foundation, offshore |
Note: For the most demanding marine projects requiring high strength, JIS A5525 SKK540 is available upon request.
3. Dimensional Range & Standards Compliance
Womic Steel supplies JIS A5525 SKK490 SSAW steel pipe piles across a wide dimensional spectrum, fully compliant with JIS A5525 and related international standards.
| Item | Specification |
| Standard | JIS A5525 (SKK400, SKK490, SKK540) |
| Manufacturing Process | SSAW (Spiral Submerged Arc Welded) - 508mm-3,000mm OD |
| Outside Diameter Range | 508mm – 3,000mm (20" – 120") |
| Wall Thickness Range | 6.0mm – 25.4mm |
| Length Range | Standard: 6m, 12m, 18m / Custom: up to 60m |
| End Finish | Plain End (PE) / Beveled End (BE) with sacrificial steel rings optional |
| Surface Finish | Bare / Oiled / Black Coated / 3PE / FBE / Coal Tar Epoxy |
| Tolerances | OD: ±1.0% / WT: ±10% / Length: +50mm -0mm |
4. Available Dimensions & Specifications - JIS A5525 SKK490 SSAW Steel Pipe Pile
SSAW Pipe Pile (508mm – 3,000mm OD)
| OD (mm) | Wall Thickness (mm) Options | Weight (kg/m) | Standard Length |
| 508 – 610 | 6.0, 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 74.3 – 360.5 | 6m / 12m / 18m |
| 610 – 762 | 6.0, 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 89.4 – 454.3 | 6m / 12m / 18m |
| 762 – 914 | 6.0, 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 111.9 – 548.2 | 6m / 12m / 18m / 24m |
| 914 – 1,067 | 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 178.7 – 642.4 | 6m / 12m / 18m / 24m |
| 1,067 – 1,220 | 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 209.0 – 736.5 | 6m / 12m / 18m / 24m |
| 1,220 – 1,422 | 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 298.4 – 859.8 | 6m / 12m / 18m / 24m |
| 1,422 – 1,625 | 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 348.2 – 986.5 | 6m / 12m / 18m / 24m |
| 1,625 – 2,000 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 477.1 – 1,217.4 | 6m / 12m / 18m |
| 2,000 – 2,500 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 588.5 – 1,527.2 | 6m / 12m / 18m |
| 2,500 – 3,000 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 736.5 – 1,841.7 | 6m / 12m / 18m |
Note: Custom dimensions outside these ranges available upon request.
5. Common Asian and International Piling Standards Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application |
| JIS Piling Standards | ||
| JIS A5525 | SKK400, SKK490, SKK540 | Steel pipe piles for harbor and marine structures |
| JIS A5528 | SY295, SY390 | Steel tubular sheet piles for port construction |
| JIS G3444 | STK290, STK400, STK490, STK540 | Carbon steel tubes for structural piling |
| JIS G3136 | SN400, SN490 | Steel for building foundation piling |
| KS Standards | ||
| KS D 3566 | STK290, STK400, STK490, STK540 | Korean standard structural tubes for piling |
| KS D 3862 | SKK400, SKK490, SKK540 | Korean standard steel pipe piles |
| ASTM Standards | ||
| ASTM A252 | GR.1, GR.2, GR.3 | Steel pipe piles for deep foundation |
| EN Standards | ||
| EN 10248 | S235GP, S275GP, S355GP | Hot-rolled steel sheet piling and pipe piling |
Usage: Harbor piling, port construction, breakwater foundation, wharf and dock piling, bridge foundation, coastal protection, deep foundation engineering, land reclamation, offshore platform foundation
6. Manufacturing Process - SSAW (Spiral Submerged Arc Welded) Steel Pipe Pile
SSAW Manufacturing Process for Pipe Pile (508mm – 3,000mm OD):
Raw Material Inspection (Coil): Incoming hot-rolled steel coils are verified for chemical composition, mechanical properties, and surface quality against JIS A5525 SKK490 specifications. Each coil is assigned a unique heat number to ensure full material traceability throughout production.
Uncoiling & Leveling: Steel coils are loaded onto the uncoiler and fed through a precision leveling machine to flatten the strip.
Edge Milling & Trimming: Both longitudinal edges of the steel strip are milled and trimmed to precise width tolerance (±0.5mm).
Spiral Forming: The leveled strip is fed into a spiral forming machine at a controlled helix angle.
Inner Submerged Arc Welding (SAW): The inner spiral seam is welded first using automatic submerged arc welding equipment.
Outer Submerged Arc Welding (SAW): The outer spiral seam is welded immediately after the inner weld.
Cutting to Length: The continuous spiral welded pipe is cut to specified lengths.
Non-Destructive Testing (NDT):
100% Ultrasonic Testing (UT): Automatic UT system inspects the entire spiral weld seam and full pipe body.
Radiographic Testing (RT): X-ray or gamma-ray inspection of weld seam.
Magnetic Particle Inspection (MPI): Inspection of weld toes and heat-affected zone.
End Finishing: Plain ends or beveled ends. Sacrificial steel rings may be welded to pipe ends for additional protection during pile driving.
Final Inspection & Marking: Visual inspection, dimensional verification, and permanent marking per JIS A5525.
Advantages of SSAW Process for Pipe Pile:
1. Ability to produce very large diameters
2. Continuous production process for high efficiency
3. Cost-effective for large diameter piling applications
7. Quality Control & Testing Procedures for JIS A5525 SKK490 SSAW Pipe Pile
| Stage | Inspection Method | Purpose |
| Raw Material (Coil) | Chemical Analysis (OES Spectrometer) | Verify compliance with JIS A5525 composition limits |
| Raw Material (Coil) | Tensile Testing | Verify yield strength, tensile strength, elongation |
| Raw Material (Coil) | Ultrasonic Testing | Detect internal laminations and defects |
| In-Process | Dimensional Inspection (Micrometers) | Monitor OD, WT during spiral forming |
| Weld Zone | Ultrasonic Testing (UT) - On-Line | Detect weld discontinuities, lack of fusion |
| Weld Zone | Radiographic Testing (RT) | Verify weld penetration, porosity, slag inclusion |
| Finished Pipe | Dimensional Inspection | Verify OD, WT, length, straightness, roundness |
| Finished Pipe | Hydrostatic Testing (Optional) | Verify pressure integrity |
| Finished Pipe | Guided Bend Test | Verify weld ductility and soundness |
| Finished Pipe | Visual & Surface Inspection | Check for surface defects, laminations, cracks |
| Finished Pipe | Marking Verification | Ensure permanent marking per JIS A5525 |
Quality Documentation:
1. Mill Test Certificate per EN 10204 Type 3.1
2. Ultrasonic Test Report (weld and body)
3. Radiographic Test Report (if specified)
4. Dimensional Inspection Report
5. Traceability from heat number to finished pipe
8. Primary Applications - JIS A5525 SKK490 SSAW Steel Pipe Pile
JIS A5525 SKK490 SSAW steel pipe piles are essential components in harbor, port, and marine construction projects in Asian markets:
Harbor Piling: Foundation piles for harbor structures, including container terminals, bulk cargo terminals, and passenger terminals.
Port Construction: Piling for port infrastructure, including quay walls, wharves, and jetties.
Breakwater Foundation: Foundation piles for breakwater structures, protecting harbors and coastlines from wave action.
Wharf & Dock Piling: Piling for wharf and dock structures, providing structural support for deck structures and mooring systems.
Bridge Foundation: Deep foundation piles for bridge piers and abutments.
Coastal Protection: Piling for seawall structures, coastal revetments, and shoreline protection.
Deep Foundation Engineering: Load-bearing piles for high-rise buildings and industrial facilities.
Land Reclamation: Piling for reclamation area containment structures and perimeter seawalls.
9. Packaging & Shipping - JIS A5525 SKK490 SSAW Steel Pipe Pile
JIS A5525 SKK490 SSAW steel pipe piles are packaged and shipped with utmost care to ensure their protection during transit.
Packaging:
Protective Coating: Before packaging, pipes may be coated with anti-rust oil. Bare finish also available.
Bundling (Small Diameters): For smaller diameter pipes (below 610mm), pipes are bundled together in hexagonal or rectangular bundles.
Individual Stacking (Large Diameters): For larger diameter pipes (above 610mm), pipes are handled and shipped individually.
End Caps: Plastic or steel end caps protect beveled ends.
Sacrificial Steel Rings (Optional): Welded to the driving end for enhanced protection during pile driving.
Shipping:
Mode of Transportation: Pipes are shipped via container vessels, bulk carriers, or rail freight.
Containerization (Small Diameters): For smaller diameter pipes, pipes are loaded into standard 20ft or 40ft shipping containers.
Bulk Vessel Loading (Large Diameters & Large Volumes): For large-volume orders, pipes are loaded directly into bulk carriers.
Labeling and Documentation: Each bundle or individual pipe is clearly labeled with material grade, standard, dimensions, and heat number.
In summary, Womic Steel ensures that all JIS A5525 SKK490 SSAW steel pipe piles are packaged with industry-leading protective measures and shipped using reliable transportation methods.
10. Womic Steel Advantages & FAQ - JIS A5525 SKK490 SSAW Steel Pipe Pile
Why Partner with Womic Steel for JIS A5525 SKK490 SSAW Pipe Pile?
Complete Range of Sizes: SSAW process covering 508mm to 3,000mm OD, wall thickness up to 25.4mm, lengths up to 60m.
Japanese Standard Focus: Specialized experience in JIS A5525 SKK490 piling applications for Asian marine projects.
Sacrificial Steel Rings: In-house welding of sacrificial steel rings for enhanced pile driving protection.
Value-Added Services: End beveling, plain end cutting, protective coating (FBE, 3LPE, Coal Tar Epoxy).
Long Length Capability: Up to 60m single length for deep foundation projects.
Competitive Logistics: Strategic partnership with global freight forwarders ensures cost-effective worldwide shipping.
Comprehensive Documentation: Full Mill Test Certificates, NDT reports, dimensional reports, and traceability documentation.
Choose Womic Steel Group as your reliable partner for high-quality JIS A5525 SKK490 SSAW steel pipe piles for Asian marine and deep foundation projects worldwide. Welcome to inquire!
Website: www.womicsteel.com
Email: sales@womicsteel.com
Tel/WhatsApp/WeChat:
Victor: +86-15575100681
Jack: +86-18390957568
Frequently Asked Questions (FAQ) - JIS A5525 SKK490 SSAW Steel Pipe Pile
Q: What is the difference between JIS A5525 SKK490 and ASTM A252 GR.3?
A: JIS A5525 SKK490 has a minimum tensile strength of 490 MPa, while ASTM A252 GR.3 has 455 MPa. SKK490 has a minimum yield strength of 325 MPa, compared to 345 MPa for GR.3. SKK490 is widely specified in Asian markets, while GR.3 is more common in American markets.
Q: What is the difference between SKK490 and SKK540?
A: SKK490 has a minimum tensile strength of 490 MPa and yield strength of 325 MPa. SKK540 has higher strength with minimum tensile strength of 540 MPa and yield strength of 390 MPa. SKK540 is recommended for more demanding applications.
Q: What is a sacrificial steel ring?
A: A sacrificial steel ring is a short steel section welded to the driving end of a piling pipe that absorbs impact energy from the pile driving hammer, protecting the pipe end from deformation.
Q: What coating options are available for marine piling pipe?
A: We offer FBE, 3LPE, 3LPP, Coal Tar Epoxy, Hot Dip Galvanizing, and Liquid Epoxy.
Q: Can you supply piling pipe with third-party inspection?
A: Yes. We facilitate inspections by SGS, BV, TÜV, DNV, ABS, LR, or any client-nominated representative.
Q: What documentation is provided with each shipment?
A: Mill Test Certificate, Dimensional Inspection Report, UT Reports, RT Reports (if specified), Traceability Documentation, Packing List, Commercial Invoice, and Certificate of Origin.
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